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当开始SPI的FIFO之后，SPI每次800US执行一次发送和读取，不加标志位为什么一直读取不到？加上之后就可以读取到了。急求！！！！这个开启FIFO的函数
加上就可以不加上就不行？请教一下为什么呢
这个开启FIFO的函数
